AD5231 datasheet(13/28 Pages) AD

13 / 28 page

Data Sheet

AD5231

Rev. D | Page 13 of 28

TEST CIRCUITS

Figure 26 to Figure 35 define the test conditions used in the specifications.

DUT

VMS

NC = NO CONNECT

Figure 26. Resistor Position Nonlinearity Error

(Rheostat Operation; R-INL, R-DNL)

DUT

VMS

V+

V+ = VDD

1LSB = V+/2N

Figure 27. Potentiometer Divider Nonlinearity Error (INL, DNL)

DUT

VMS1

VMS2

RW = [VMS1 – VMS2]/IW

Figure 28. Wiper Resistance

VMS

VDD

V+

V+ = VDD ±10%

PSRR (dB) = 20 log

ΔVMS

ΔVDD

PSS (%/%) =

ΔVMS%

ΔVDD%

Figure 29. Power Supply Sensitivity (PSS, PSRR)

OFFSET BIAS

OFFSET

GND

DUT

VIN

VOUT

OP279

Figure 30. Inverting Gain

OFFSET BIAS

OFFSET

GND

DUT

VIN

VOUT

OP279

Figure 31. Noninverting Gain

OFFSET

GND

DUT

+15V

VOUT

VIN

OP42

–15V

+2.5V

Figure 32. Gain vs. Frequency

–

DUT

CODE = 0x000

0.1V

VBIAS

RSW =

0.1V

ISW

NC = NO CONNECT

Figure 33. Incremental On Resistance

ICM

VCM

VDD

DUT

GND

VSS

NC = NO CONNECT

Figure 34. Common-Mode Leakage Current

200µA

IOL

200µA

IOH

VOH (MIN)

VOL (MAX)

TO OUTPUT

50pF

Figure 35. Load Circuit for Measuring VOH and VOL (The diode bridge test

circuit is equivalent to the application circuit with RPULL-UP of 2.2 kΩ)

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